如何删除docker镜像构建成功后留下的临时镜像？

Question

看下面的： 7.3-fpm-alpine 是基础镜像，7.3-fpm_alpine_2020-03-28 是我构建出来的目标镜像，中间那么多个无名的镜像并且还很大，为什么会有这样的东西，并且无法删除？删除时报错：Error response from daemon: conflict: unable to delete 00ad77b9098b (cannot be forced) - image has dependent child images.

php                   7.3-fpm_alpine_2020-03-28   50bc85a6cc8f        16 minutes ago      521MB
<none>                <none>                      00ad77b9098b        17 minutes ago      521MB
<none>                <none>                      8725973170d7        17 minutes ago      521MB
<none>                <none>                      a9f7ceab029f        17 minutes ago      521MB
<none>                <none>                      77507ec3a424        41 minutes ago      77.2MB
<none>                <none>                      4ed661333c43        41 minutes ago      77.2MB
<none>                <none>                      1a4ea387341c        41 minutes ago      77.2MB
<none>                <none>                      f4be8002f88e        41 minutes ago      74.6MB
<none>                <none>                      22dddae2cdcd        41 minutes ago      77.2MB
php                   7.3-fpm-alpine              c127a826ef7f        4 days ago          74.6MB

我的dockerfile是这样写的，希望大神帮我指点一下：中间那么多个无名的镜像并且还很大，为什么会有这样的东西。

FROM php:7.3-fpm-alpine
MAINTAINER huangwh 306049836@qq.com

# 先把protobuf2.6下载到本地，然后copy进去。
COPY ./protobuf-2.6.1.tar.gz /tmp/protobuf-2.6.1.tar.gz

# 安装composer并允许root用户运行
ENV COMPOSER_ALLOW_SUPERUSER=1
ENV COMPOSER_NO_INTERACTION=1
ENV COMPOSER_HOME=/usr/local/share/composer

RUN sed -i 's/dl-cdn.alpinelinux.org/mirrors.aliyun.com/g' /etc/apk/repositories \
    && apk --update upgrade \
    && apk add --no-cache libtool libmcrypt-dev freetype-dev libjpeg-turbo-dev autoconf rabbitmq-c rabbitmq-c-dev libcurl git libpng-dev gcc g++  make libcurl curl-dev libxml2-dev dpkg dpkg-dev imagemagick-dev zlib-dev libzip-dev libzip postgresql-dev bzip2-dev aspell-dev freetds-dev tidyhtml-dev libxslt-dev libintl musl-libintl icu-libs icu-dev  \
&& pecl install amqp \
&& pecl install mongodb \
&& pecl install -o -f redis \
&& pecl install xdebug \
&& pecl install imagick \
&& pecl install mcrypt \
&& docker-php-ext-enable mcrypt redis amqp mongodb imagick \
&& docker-php-ext-install mysqli pdo pdo_dblib pdo_pgsql  dba pdo_mysql mbstring bcmath zip bz2 opcache curl soap sockets tokenizer xml pcntl calendar exif gettext intl   pgsql pspell shmop sysvmsg sysvsem sysvshm tidy wddx xsl\
&& docker-php-ext-configure gd --with-freetype-dir=/usr/include/ --with-jpeg-dir=/usr/include/ --with-png-dir=/usr/include/ \
&& docker-php-ext-install -j$(nproc) gd \
&& rm -rf /var/cache/apk \
    && cd /tmp && tar zxvf protobuf-2.6.1.tar.gz\
    && cd protobuf-2.6.1 \
    && ./configure --prefix=/usr/local/protobuf \
    && make && make install \
    && export PATH=/usr/local/protobuf/bin:$PATH \
    && protoc --version \
    && cd /var/www/html && rm -rf /tmp/protobuf-2.6.1 \
&& mkdir -p /usr/local/share/composer \
    && curl -o /tmp/composer-setup.php https://getcomposer.org/installer \
    && php /tmp/composer-setup.php --no-ansi --install-dir=/usr/local/bin --filename=composer --snapshot \
    && rm -f /tmp/composer-setup.* \
    && composer config -g repo.packagist composer https://packagist.phpcomposer.com \
    && composer -V \
&& cp /usr/local/etc/php/php.ini-development /usr/local/etc/php/php.ini \
&& echo "build successfulty!"

LABEL Author="ealson"
LABEL Version="php73_pb26"
LABEL Description="PHP 7.3.7 开发环境镜像."
# docker build -t php:7.3-fpm_alpine_2020-03-28 ./

Answer 1

另一个问题，这里镜像这么多，构建 完了的镜像其实就一个 7.3-fpm_alpine_2020-03-28 所以，这个为了构建出这个镜像，是不是占用的空间就是下面这些每个子镜像的占用空间之和？那这样可大了。。

php                   7.3-fpm_alpine_2020-03-28   50bc85a6cc8f        16 minutes ago      521MB
<none>                <none>                      00ad77b9098b        17 minutes ago      521MB
<none>                <none>                      8725973170d7        17 minutes ago      521MB
<none>                <none>                      a9f7ceab029f        17 minutes ago      521MB
<none>                <none>                      77507ec3a424        41 minutes ago      77.2MB
<none>                <none>                      4ed661333c43        41 minutes ago      77.2MB
<none>                <none>                      1a4ea387341c        41 minutes ago      77.2MB
<none>                <none>                      f4be8002f88e        41 minutes ago      74.6MB
<none>                <none>                      22dddae2cdcd        41 minutes ago      77.2MB
php                   7.3-fpm-alpine              c127a826ef7f        4 days ago          74.6MB